From: "milton_aupperle" <milton@outcastsoft.com>

Date: November 7, 2010 1:44:11 PM MST

To: Astro_IIDC@yahoogroups.com

Subject: Full Light Curves for pulsating variable star CY AQR

Hi Folks;

Seeing was mediocre to bad last night with FWMH stars in the 6 to 10 arc second range. And we had thin high haze so that imaging anything faint would get "lost" in the amplified background light pollution.

So I decided to do a 3 hour (20101107 01:40:44.55 UTC to 04:46:59.55 UTC) run of Photometric measurements (at 25 second intervals) for pulsating variable star CY AQR.

Here is the resulting light curve over two complete cycles:

http://groups.yahoo.com/group/Astro_IIDC/files/Other/20101106_CY_AQR.png 

Imaging, Guiding (on a Mag 8.04 star), Darks subtraction, Flat leveling and Photometric processing all done in Astro IIDC. Graph generation, labeling and smoothed fitted curves were done in "Plot". I had the initial data curves generated from the 448 images / 1.2 gigabyte movie collected within 20 minutes of finishing the shoot, including darks and flats on the old G4 1.25 gigahz Mac Laptop.

Note that I'm shooting with a wide band Luma filter and not a "Visual" (basically a Green) filter, so the stated Visual magnitudes do not correlate with my Relative magnitudes. The Grasshopper EXHAD CCD is a lot more sensitive in the Blue Green spectrum than the Red spectrum, so reddish stars (B-V: > 0.5) are under represented compared to a white (B-V: ~ 0) or a blue (B-V: < -0.1) stars. I could shoot with the Astro Don Green filter, but that would increase the exposure time to about 75 seconds and that's too long for a fast changer like this and turbulent skies. I would need more aperture (around a C14) to do "Visual" photometry.

TTYL..

Milton Aupperle